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 ###Instrução: Qual liga foi disputada em 2007?
 ###Tabelas: CREATE TABLE power_stroke_diesel_200 (power_stroke_diesel_200_id AUTO_INCREMENT PRIMARY KEY, Pos. INT, Car # INT, Driver VARCHAR, Make VARCHAR, Team VARCHAR) CREATE TABLE groupe_a (groupe_a_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Club VARCHAR, Points INT, Played INT, Victories INT, Draws INT, Defeats INT, Goals for INT, Goals against INT, Goal average INT) CREATE TABLE men's_doubles:_16_10_titles_6_runner-ups (men's_doubles:_16_10_titles_6_runner-ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents in the final VARCHAR, Score in the final VARCHAR) CREATE TABLE 2003–2009 (2003–2009_id AUTO_INCREMENT PRIMARY KEY, Poll Year VARCHAR, Winner VARCHAR, Second VARCHAR, Third VARCHAR, Fourth VARCHAR, Fifth VARCHAR, Sixth VARCHAR, Seventh VARCHAR, Eighth VARCHAR, Ninth VARCHAR, Tenth VARCHAR) CREATE TABLE year-by-year (year-by-year_id AUTO_INCREMENT PRIMARY KEY, Year INT, Division INT, League VARCHAR, Regular Season VARCHAR, Playoffs VARCHAR, Open Cup VARCHAR, Avg. Attendance INT)  
SELECT League FROM year-by-year WHERE Year = 2007